RIGOL DSG3000 Series - Manual (Page 62)

RIGOL Chapter 2 Front Panel Operations
2-22 DSG3000 User’s Guide
Frequency Modulation (FM)
During frequency modulation (FM), the modulating signal changes the frequency of
the RF carrier waveform.
To Enable FM
Press FM/øM  FM/ Φ M to select “FM” and press Switch to select “On” or “Off”.
 On: enable the FM function. The backlight of FM/øM goes on and the FM label
is displayed in the function status area in the user interface.
 Off: disable the FM function and this is the default state.
NOTE: The frequency modulation and phase modulation cannot be enabled at the
same time.
To Select the Modulation Source
Press FM/øM  Source to select “Int”, “Ext” or “Int & Ext” modulation source.
1. Internal Source
After selecting “Int”, the internal modulation source is turned on. At this point,
the instrument provides the modulating signal and you can set the modulation
frequency and modulation waveform of the modulating signal.
2. External Source
After selecting “Ext”, Rate and Waveform are grayed out and disabled. The RF
signal generator receives the external modulating signal input from the [EXT
MOD INPUT] connector (as shown in the figure below) at the front panel. This
modulating signal can be any waveform.
NOTE: The input amplitude of external modulating signal reaches +/-3V.
3. Internal & External
After selecting “Int & Ext”, both internal and external modulating sources are
selected at the same time and you can perform dual-tone FM signal modulation.